arch/powerpc/include/asm/kdump.h

   1 #ifndef _PPC64_KDUMP_H
   2 #define _PPC64_KDUMP_H
   3
   4 #include <asm/page.h>
   5
   6 #define KDUMP_KERNELBASE        0x2000000
   7
   8 /* How many bytes to reserve at zero for kdump. The reserve limit should
   9  * be greater or equal to the trampoline's end address.
  10  * Reserve to the end of the FWNMI area, see head_64.S */
  11 #define KDUMP_RESERVE_LIMIT     0x10000 /* 64K */
  12
  13 #ifdef CONFIG_CRASH_DUMP
  14
  15 /*
  16  * On PPC64 translation is disabled during trampoline setup, so we use
  17  * physical addresses. Though on PPC32 translation is already enabled,
  18  * so we can't do the same. Luckily create_trampoline() creates relative
  19  * branches, so we can just add the PAGE_OFFSET and don't worry about it.
  20  */
  21 #ifdef __powerpc64__
  22 #define KDUMP_TRAMPOLINE_START  0x0100
  23 #define KDUMP_TRAMPOLINE_END    0x3000
  24 #else
  25 #define KDUMP_TRAMPOLINE_START  (0x0100 + PAGE_OFFSET)
  26 #define KDUMP_TRAMPOLINE_END    (0x3000 + PAGE_OFFSET)
  27 #endif /* __powerpc64__ */
  28
  29 #define KDUMP_MIN_TCE_ENTRIES   2048
  30
  31 #endif /* CONFIG_CRASH_DUMP */
  32
  33 #ifndef __ASSEMBLY__
  34
  35 #if defined(CONFIG_CRASH_DUMP) && !defined(CONFIG_RELOCATABLE)
  36 extern void reserve_kdump_trampoline(void);
  37 extern void setup_kdump_trampoline(void);
  38 #else
  39 /* !CRASH_DUMP || RELOCATABLE */
  40 static inline void reserve_kdump_trampoline(void) { ; }
  41 static inline void setup_kdump_trampoline(void) { ; }
  42 #endif
  43
  44 #endif /* __ASSEMBLY__ */
  45
  46 #endif /* __PPC64_KDUMP_H */